The sandwich rock wool board has outstanding performance in performance characteristics: with regard to the fire protection, the rock wool is the incombustible material, and has Class A combustion performance; and when meeting fire, no smoke or spark is caused.
The rock wool is free from poisonous and harmful substances, and do not release the gas bad for the environment and human body even in the high temperature state. With regard to the water resistance, the rock wool has strong hydrophobicity and small water vapor permeation resistance, and thus can effectively reduce the mildew situation of building wall. With regard to the thermal insulation, the rock wool has small thermal conductivity and good thermal insulation performance. With regard to the sound absorption, the rock wool is a porous fibrous material, and when the sound passes through it, the sound energy can be consumed due to the vibration and mutual friction of fiber, and thus, it plays the sound absorption effect. With regard to the stability, the rock wool has high stability, its thermal conductivity is not changed with time, its expansion rate is low, and no additional stress is produced to the gridding cloth, mortar and others on the surface due to the heat expansion and cold contraction; and meanwhile, the rock wool is free from active elements and corrosive components, also free from solvent, oil substance or softener affecting the building, difficult to age, and can have the same life with the main building. With regard to mechanical property, through the improvement of production process, on the one hand, the rock wool has better compressive strength and tensile strength, and on the other hand, it also has easy construction, and can be cut into required shape with simple cutting tool on the construction site.
The rock wool, as the external insulation material of external wall, has been widely used in Europe and America and other developed countries; and its relevant technology and standard also have been matured. But in China, the rock wool is mainly used in the industrial insulation fields, but less in the building insulation fields; and its form is limited to loosely filled insulation, and the external insulation application of external wall is less developed. But, with the introduction of relevant documents, the combustion performance rating of material for external insulation of external wall is highlighted and emphasized, and especially, provision that the material with Class A combustion performance is adopted by the civil buildings, which provides the development opportunity for the wide application of rock wool and other materials having outstanding fireproof performance in the external insulation field of external wall.
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